CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Thousands	Total	Previously Reported [Member]	Restatement Adjustment [Member]	Common Stock [Member]	Common Stock [Member] Previously Reported [Member]	Additional Paid in Capital [Member]	Additional Paid in Capital [Member] Previously Reported [Member]	Earnings Less than Distributions [Member]	Earnings Less than Distributions [Member] Previously Reported [Member]	Earnings Less than Distributions [Member] Restatement Adjustment [Member]	Accumulated Other Comprehensive (Loss) Income [Member]	Accumulated Other Comprehensive (Loss) Income [Member] Previously Reported [Member]	Noncontrolling Interest [Member] Consolidated Joint Ventures [Member]	Noncontrolling Interest [Member] Consolidated Joint Ventures [Member] Previously Reported [Member]	Noncontrolling Interest [Member] Consolidated Real Estate Fund [Member]	Noncontrolling Interest [Member] Consolidated Real Estate Fund [Member] Previously Reported [Member]	Noncontrolling Interest [Member] Consolidated Real Estate Fund [Member] Restatement Adjustment [Member]	Noncontrolling Interest [Member] Operating Partnership [Member]	Noncontrolling Interest [Member] Operating Partnership [Member] Previously Reported [Member]
Beginning balance at Dec. 31, 2017	$ 5,029,170	$ 5,022,084		$ 2,403	$ 2,403	$ 4,297,948	$ 4,297,948	$ (133,164)	$ (133,693)		$ 10,083	$ 10,083	$ 404,997	$ 404,997	$ 21,106	$ 14,549		$ 425,797	$ 425,797
Beginning balance (Basis adjustment upon adoption of ASU 2017-05) at Dec. 31, 2017			$ 7,086							$ 529							$ 6,557
Common stock, shares outstanding at Dec. 31, 2017				240,427,000	240,427,000
Net (loss) income	18,993							9,147					8,182		720			944
Common shares issued upon redemption of common units				$ 2		3,459
Common shares issued upon redemption of common units				203,000
Redemption of minority interest in operating partnerships																		(3,461)
Common shares issued under Omnibus share plan, net of shares withheld for taxes	(213)							(213)
Common shares issued under Omnibus share plan, net of shares withheld for taxes				61,000
Repurchases of common shares	(105,383)			$ (76)		(105,307)
Repurchases of common shares, shares				(7,555,000)
Dividends and distributions	(105,746)							(95,506)										(10,240)
Contributions from noncontrolling interests	45,116														45,116
Distributions to noncontrolling interests	(18,184)												(18,184)
Change in value of interest rate swaps	7,273										6,605							668
Pro rata share of other comprehensive (loss) income of unconsolidated joint ventures	(129)										(67)				(55)			(7)
Amortization of equity awards	20,937					2,943												17,994
Reallocation of noncontrolling interest						2,713												(2,713)
Other	(170)							(170)
Ending balance at Dec. 31, 2018		4,891,664			$ 2,329		4,201,756		(219,906)			16,621		394,995		66,887			428,982
Common stock, shares outstanding at Dec. 31, 2018					233,136,000
Net (loss) income	(29,603)							(36,899)					11,022		313			(4,039)
Common shares issued upon redemption of common units				$ 14		24,016
Common shares issued upon redemption of common units				1,409,000
Redemption of minority interest in operating partnerships																		(24,030)
Common shares issued under Omnibus share plan, net of shares withheld for taxes	(324)			$ 3				(327)
Common shares issued under Omnibus share plan, net of shares withheld for taxes				46,000
Repurchases of common shares	(94,617)			$ (72)		(94,545)
Repurchases of common shares, shares				(7,159,000)
Dividends and distributions	(102,464)							(92,425)										(10,039)
Contributions from noncontrolling interests	14,989														14,989
Distributions to noncontrolling interests	(45,239)												(45,239)
Change in value of interest rate swaps	(28,069)										(25,367)							(2,702)
Settlement of interest rate swaps liabilities	11,258										8,431							2,827
Pro rata share of other comprehensive (loss) income of unconsolidated joint ventures	206										144				47			15
Amortization of equity awards	23,001					2,564												20,437
Acquisition of noncontrolling interest	(9,840)														(9,840)
Reallocation of noncontrolling interest						(607)												607
Ending balance at Dec. 31, 2019	$ 4,630,962	$ 4,630,962		$ 2,274	$ 2,274	4,133,184	$ 4,133,184	(349,557)	$ (349,557)		(171)	$ (171)	360,778	$ 360,778	72,396	$ 72,396		412,058	$ 412,058
Common stock, shares outstanding at Dec. 31, 2019	227,432,030			227,432,000	227,432,000
Net (loss) income	$ (19,196)							(24,704)					9,257		(1,450)			(2,299)
Common shares issued upon redemption of common units				$ 51		85,659
Common shares issued upon redemption of common units				5,150,000
Redemption of minority interest in operating partnerships																		(85,710)
Common shares issued under Omnibus share plan, net of shares withheld for taxes	(332)			$ 1				(333)
Common shares issued under Omnibus share plan, net of shares withheld for taxes				48,000
Repurchases of common shares	(120,000)			$ (138)		(119,862)
Repurchases of common shares, shares				(13,813,158)
Dividends and distributions	(89,603)							(81,799)										(7,804)
Contributions from noncontrolling interests	11,555												3,500		8,055
Distributions to noncontrolling interests	(12,717)												(12,717)
Pro rata share of other comprehensive (loss) income of unconsolidated joint ventures	(13,894)										(12,620)				16			(1,290)
Amortization of equity awards	19,386					1,318												18,068
Sale of a 10.0% interest in 1633 Broadway	109,573					33,230							76,343
Reallocation of noncontrolling interest						(13,356)												13,356
Ending balance at Dec. 31, 2020	$ 4,515,734			$ 2,188		$ 4,120,173		$ (456,393)			$ (12,791)		$ 437,161		$ 79,017			$ 346,379
Common stock, shares outstanding at Dec. 31, 2020	218,817,337			218,817,000